Apparatus for finishing insulator shells



A ly comprise V bers.

. groove,

' ture and purpose proceed to a Patented Apr. 2 2, 1930 s T ssIe ME-NTs, 'ro

PENNsYLvANIA, A

nnnornrclsnnvron SUPPLIES ooMrANY, or PHILADELPHIA, oonPoRATIoN oErENNsYLvANIA r APPARATUSFOB FINISHING INSUL TOBQs ELLS Application filed'J'anuary 11,1927. s rialan).160,509.

' My invention relates to apparatus for finishing insulator shells and more particularly to an apparatus for undercutting, grooving or otherwise recessing the exterior surfaceof thehead of an insulator shell.

Insulators, such as are used port of high tension electric lines, and especially insulators of the suspension type usualrespectively to be secured to a support and to a cable to be supported, and a center shell,

or non-conducting member, usually made of porcelain, which'acts to insulate the cap" from the pm. The usual center shell com prises a head portion for the reception of a recessed for the reception of a pin from which depends one or more including the cap and and an apron sklrts. The several members,

shell, are assembled together and secured in- V assembled relation, usually by the use ,of

Portland cement placed between the incinter shellis' used between the capand pin members, the center shells being assembled together and secured by the use .of cement.

The cement used for securing'the members of an insulatortogether usually bonds with the porcelain center shell and itis known to provide the center shell with specially-pres pared surfaces, tacts, to increase the bond of the cement or to undercut or otherwise, recess 7 such surfaces to enable the cement tofkey thereto. The recessing of the. surface of a center shell has heretofore presented a problem of some difliculty since the recessing must be accom-' plished tion, preferably in the condition in which it is whenremoved from the mold, and in whichcondition it must be handled with considerable care, since it may readily bedeformed.

' Now, it is the object of'my invention to provide an apparatus for-undercutting,groov- I or otherwise recessing thesurface of the head portion of the center shell, or non-con- .ducting member,-of an insulator.

Having indicated ina' general, ay the naof'my invention, I will now detailed descriptionthereof with A re erence to the accompanying drawings in ing my invention, for the sup- I deelevation of the cutting 'tool forming an element 'ofthe apparatus cap and pin members, adapted -Figure 2.; i

l is a side elevation of a modified; form of tool. I

In some instances more than one. cen

with which the'ceme'nt' conof such a while the shell is in the proper condi-' which there" s illustrated Inent and'in which? 1 Figure 1-;is a view partly broken away ofan apparatus embody- Figure 2 1s a s shown in Figure 1.

FigureBis a sectional'view on line 3-8.

Figure In the drawings a port, having sides Z) and supported bylegs c.

Centrally of the table a is positioned a bearng' orjournalfd through which extends one end of a vertical shaft'e, suitably supported at its other end and provided wit-ha pulley flfor the reception-of a suitably driven belt whereby-the shaft isrotated. On theupper end of the shaft 6 above the table is mounted a plate orsupport g, from the center of which extends a vertical post h.: The plate or support 9 and the posth are *arran edcd. axially with each other and with the shaft 6. The plate or support gtis adapted for thes'upport of an insulator shell comprising ahead a preferred embodipartly in section and l h indicates a table,or supportion i provided with, a pinhole j and an apron la fromflwhich' depend skirts Z; The

of such a, diameter and the post it diameter; and length that when an insulator shell is placed on theplate, it will plate 9 is be supported by the engagement of one. of

the skirts' l with the it pair of uprights m connected at 'their upper. endsbya cross member a are mounted onjthe'table; Revolubly secured toone of the uprights mbetween a pair of adjustable stopso is a sleeve pto which is adjustably secured an arm 9. cured to'an end of arm 9, as'by threading it on the reduced end portion'q of the arm, and serves to support a cutting tools;- The tools consists of a ribbon-like blade provided plate and the post hlwill f *iprojectinto the pin hole'j, fitting snugly in 9 the lower portion thereof.

A tool support '1" is se-z i with a cutting edge and shaped to efiect undercutting, asshown inFigure 2, or to.

effect grooving, as shown in Figure 4, orin any other desired. manner. to effectsuch re erative engagement with a cessing as may be desired. The tool is provided Withlateral extensions 8 which are adapted to be secured to the top and bottom of the tool support r by means of bolts 6, the extensions being provided with slots u for the passage of the bolts and enabling the tool to be adjusted relative to the support.

In operation, assuming "that an insulator shell is supported on the plate l and the tool properly adjusted, the shaft 6 is moved to revolve the plate and supported shell and the arm 9 turned about the upright m to bring the cutting edge of the tool into operative relation With the shell. Thelower or undercutting portion of the blade efiects the undercutting of the exterior surface of the head of the shell','the'upper part of the blade acting, if desired to true up thesurface of the head above the undercut as the undercut s completed. During the undercutt ng operation the head of the shell is supported and the deformation thereof'due to the pressure from the tool is prevented by the post it,

which acts to back up to'the tool as Well as center and retain the insulator on the t or support 5/.

'It will be appreciated that various forms 1 of tools, such for example, as that shown in Figure 4:, may be substituted for the undercutting tool shown in Figuresl, 2 and 3,

laving now fully described my invention,

What I claim and desire to protect by Letters I Patent is i 1 In an apparatus of the character described,

in combination, a vertical shaft adapted to be rotated, a plate mounted on said shaft in a plane transverse to the axis of the shaft,

a post extending from said plate coaxially of said shaft and a tool pivotally supported on an axis parallel to the axis of said shaft and adapted to be swung into and outof opported' on said plate. 7

In testimony of Which invention I have hereunto set my hand, atNorristoWm'Pa, on this 4th day of January, 1927. Y IVILLIAM HENRY SMITH.

plate piece of work sup- 

